Improvement in hand indicator for showing the course of vessels



H. P. 11111115.l

Compass.

No. 100,821. f rammed March 1 5, 1870,

L marasma f @sind iiiif.

HORACE P; TUTTLE, OR BROOKLi-m,A NEW YORK.

. Leners PamNo. 100,821, daad March 15, 1870.

IMROVMENT IN"` HAND INDICATOR FOR- SHOWING- THE COURSE OI' VESSELS.

The Schedule referred. to in these Letters Patent and making'part' ofthe same To all whom it mag/concern mi,

Be it known that l, HORACE I?. TUTTLE, of Brookf lyn, in the county of Kings, and State of Newl York, have invented a new and improved Course-Indicator for Vessels; and I do hereby declare that the followfing is a inll, clear, and exact description thereof, which will enable' others skilled in the art to make and use `the same, reference being had to the accompanying drawings forming part of this specification. Figure 1 represents a` plan or Vtop 'view of my. improved course-indicator. 3 l x Figure 2 is a vertical section -of the same. Similar letters ot'` reference indicate corresponding parts.

,This invention relates to a new instrument by which the truecourseof a vessel, with regard to the valiations of the needle, can be readily ascertained.

`. The invention consists in the combination of two pointers turning on the same pin. They are so vground and held together that they will both move simultaneously, so that when one isset the other will also move, unless held fast.

A, in the drawing, represents a dial-plate, on ywhich d the several points of' the `compassare marked.

In its center is arranged a projecting pin,'a, upon `which two hands or pointers, B'C, are fitted, they be-- ing held down by a screw,- l).

` Their contiguous surfaces, immediately around the pin a,fare` ground together, and the pressure upon' them by the screw is sniiicient `to cause them to move together. i v

The device is used as follows:` i

The upper hand O is set on the dial-plate, to `indi- 'l f cate the course, according to compass, of the vessel,

giving the requisite margin for any displacement by wind,currents, &c. The lower hand B is then placed over. zero, to point toward north. The two hands were movedseparately to the two positions shown in the drawing, and the one not moved was held fast, While the other was set. Now, in order to find the actual course, the hand B is shifted as far toward east or west as the needle of the compass may vary at the, place where the ship is situated. By such motion the" ha'nd C will also be carried in the same direction, and will then indicate the proper direction, according to the needle. v

' Thus, if a ship should steer ESE., with a strong easterly wind causingit to go SE. in a place where the needle varies two degrees toward W., the true Acourse will be two degrees S. of SE.

By this device the mistakes frequentlyV made by captains, in trying to nd the true course, are overcome. VVheu a ship steers in a southerlyl direction, men will often calculate the course to be more toward west, when the needle varies toward the west, while such variation shows a diierence of the course toward east.

Having thus described my invention, l 4 I claim as new and desire to secure by Lett-ers Patent- A coursefindicator, consisting of a dial-plate havin g.

the several points of the compass marked thereon, projecting pin a, pointers B C, and screw b, all adjuste and operated as set forth, and for thepurpose specified.

f H. P. TUTTLE. Witnesses F. H. DODGE, Oms. D. DUNTOX. 

